ytdlp_list_subtitle_languages

ServerYouTube MCP Server
CategoryRead

How to control ytdlp_list_subtitle_languages ↓

WHAT IT DOES

What ytdlp_list_subtitle_languages does on YouTube MCP Server

AI agents call ytdlp_list_subtitle_languages to retrieve information from YouTube MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why ytdlp_list_subtitle_languages needs a policy

This is a query/list operation that gathers information about available subtitles without any side effects. The tool only inspects metadata about what subtitle options exist for a video. It does not download, modify, delete, or execute anything, making it a pure Read operation with minimal security risk.

From the tool's definition Tool retrieves and lists available subtitle languages and formats. Description explicitly states it 'retrieves the complete list' and 'returns text output showing available subtitle languages'. No data is modified, deleted, or executed.

Documented attack patterns abuse exactly the kind of access ytdlp_list_subtitle_languages gives an agent:

POLICY

How to control ytdlp_list_subtitle_languages

PolicyLayer is an MCP gateway — it sits between your AI agents and YouTube MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ytdlp_list_subtitle_languages:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ytdlp_list_subtitle_languages": {}
  }
}

ytdlp_list_subtitle_languages is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register YouTube MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More YouTube MCP Server tools

Write ytdlp_download_audio Extract and download audio from video in best quality. This tool extracts audio tracks fr Write ytdlp_download_video Download video file to the user Read ytdlp_download_transcript Generate clean plain text transcript from video subtitles. This tool downloads subtitles Read ytdlp_download_video_subtitles Download video subtitles/captions in VTT format. This tool downloads subtitle files in We Read ytdlp_get_video_comments Extract comments from a video in JSON or AI-friendly Markdown format. This tool retrieves Read ytdlp_get_video_comments_summary Get a human-readable summary of video comments. This tool extracts comments and formats t Read ytdlp_get_video_metadata Extract comprehensive video metadata in JSON format without downloading content. This too Read ytdlp_get_video_metadata_summary Get human-readable summary of key video information. This tool extracts and formats the m

All 10 YouTube MCP Server tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about ytdlp_list_subtitle_languages

What does the ytdlp_list_subtitle_languages tool do? +

List all available subtitle languages and formats for a video. This tool retrieves the complete list of subtitle/caption languages available for a video, including both manually created and auto-generated subtitles. Args: - url (string): Full video URL (YouTube, Vimeo, etc.) Returns: Text output showing: - Available subtitle languages and codes - Format options (vtt, srt, etc.) - Whether subtitles are auto-generated or manual Use when: Checking what subtitle languages are available before downloading Don. It is categorised as a Read tool in the YouTube MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on ytdlp_list_subtitle_languages? +

Register the YouTube MCP Server MCP server in PolicyLayer and add a rule for ytdlp_list_subtitle_languages: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches YouTube MCP Server. Nothing to install.

What risk level is ytdlp_list_subtitle_languages? +

ytdlp_list_subtitle_languages is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit ytdlp_list_subtitle_languages? +

Yes. Add a rate_limit block to the ytdlp_list_subtitle_languages rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block ytdlp_list_subtitle_languages completely? +

Set action: deny in the PolicyLayer policy for ytdlp_list_subtitle_languages. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides ytdlp_list_subtitle_languages? +

ytdlp_list_subtitle_languages is provided by the YouTube MCP Server MCP server (kevinwatt/yt-dlp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every YouTube MCP Server tool call.

Start from YouTube MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

Free to start. No card required.

10 YouTube MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.